How can you find what URL was used in log4j default initialization?

Question

Log4j default initialization goes through a procedure to find and use a URL to configure with. Afterward, how can you find out what URL was ultimately used, without having

Answer 1

If you can setup your own Configurator you can do something like that:

Setup the JAVA system property : -Dlog4j.configuratorClass=MyConfigurator And then have your configurator instance intercepts the doConfigure call.

public class MyConfigurator implements Configurator
{
    public static URL url;

    @Override
    public void doConfigure(URL url, LoggerRepository repository)
    {
        this.url = url;
        new PropertyConfigurator().doConfigure(url, repository);
    }
}